A late-night storm poured rain over parts of the Valley on Friday night, thrilling some desert dwellers and causing mayhem for others.

Almost word for word, potential conditions listed in an urban and small-stream flood advisory of the National Weather Service came to fruition.

Weather officials warned that runoff from heavy rainfall could cause normally dry washes to run and create "ponding" of water on streets and underpasses.

Firefighters rescued a 61-year-old woman who drove into a well-known wash in the Moon Valley area of north Phoenix and was swept off the road by flooding just before 10 p.m., according to Phoenix Fire Capt. Scott McDonald.

"It gets vehicles all the time," McDonald said of the wash. "People think they can cross it – always get caught."

Flooding on Greenway Road and the Interstate 17 underpass brought traffic to a halt at about 9 p.m. Early on, seven cars became stuck in the water. Several people pulled over to help push cars through the floodwaters, while others tried to keep drivers from driving into deeper water ahead.

In the West Valley, more than 1 1/2 inches of rain fell within an hour near Avondale, while much of Phoenix received about half an inch, according to rainfall data from the Flood Control District of Maricopa County.

The National Weather Service has forecasted increased storm activity for Saturday.